Changeset be9036d

Timestamp:

Aug 31, 2017, 3:29:38 PM (6 years ago)

Author:

Rob Schluntz <rschlunt@…>

Branches:

ADT, aaron-thesis, arm-eh, ast-experimental, cleanup-dtors, deferred_resn, demangler, enum, forall-pointer-decay, jacob/cs343-translation, jenkins-sandbox, master, new-ast, new-ast-unique-expr, new-env, no_list, persistent-indexer, pthread-emulation, qualifiedEnum, resolv-new, with_gc

Children:

326338ae

Parents:

5b21138

git-author:

Rob Schluntz <rschlunt@…> (08/31/17 15:29:33)

git-committer:

Rob Schluntz <rschlunt@…> (08/31/17 15:29:38)

Message:

Reorganize TraitInstType? and TraitDecl?, add sized trait definition to prelude

Previously, TraitInstType? cloned all of the members of TraitDecl?. This commit changes
TraitInstType? to instead contain a pointer to the base TraitDecl?, analogous to StructInstType?
and StructDecl?, etc. In particular, this makes the code simpler and makes it easier to
fully expand the members of a trait declaration.

Location:

src

Files:

• ResolvExpr/RenameVars.cc (modified) (1 diff)
• SymTab/Indexer.cc (modified) (1 diff)
• SymTab/Validate.cc (modified) (4 diffs)
• SynTree/Mutator.cc (modified) (1 diff)
• SynTree/ReferenceToType.cc (modified) (1 diff)
• SynTree/Type.h (modified) (1 diff)
• SynTree/TypeSubstitution.h (modified) (1 diff)
• SynTree/Visitor.cc (modified) (1 diff)
• prelude/prelude.cf (modified) (1 diff)

src/ResolvExpr/RenameVars.cc

@@ -88 +88 @@
                 typeBefore( aggregateUseType );
                 acceptAll( aggregateUseType->get_parameters(), *this );
-                acceptAll( aggregateUseType->get_members(), *this );
                 typeAfter( aggregateUseType );
         }

src/SymTab/Indexer.cc

@@ -554 +554 @@
 
 
-        void Indexer::visit( TraitInstType *contextInst ) {
-                acceptAll( contextInst->get_parameters(), *this );
-                acceptAll( contextInst->get_members(), *this );
+        void Indexer::visit( TraitInstType *traitInst ) {
+                acceptAll( traitInst->get_parameters(), *this );
         }
 

src/SymTab/Validate.cc

@@ -127 +127 @@
           public:
                 LinkReferenceToTypes( bool doDebug, const Indexer *indexer );
-                using Parent::visit;
+                using Parent::visit;
+                void visit( TypeInstType *typeInst ) final;
+
                 void visit( EnumInstType *enumInst ) final;
                 void visit( StructInstType *structInst ) final;
                 void visit( UnionInstType *unionInst ) final;
-                void visit( TraitInstType *contextInst ) final;
+                void visit( TraitInstType *traitInst ) final;
+
                 void visit( EnumDecl *enumDecl ) final;
                 void visit( StructDecl *structDecl ) final;
                 void visit( UnionDecl *unionDecl ) final;
-                void visit( TypeInstType *typeInst ) final;
+                void visit( TraitDecl * traitDecl ) final;
+
           private:
                 const Indexer *indexer;
@@ -453 +457 @@
         }
 
-        void LinkReferenceToTypes::visit( TraitInstType *traitInst ) {
+        template< typename Decl >
+        void normalizeAssertions( std::list< Decl * > & assertions ) {
+                // ensure no duplicate trait members after the clone
+                auto pred = [](Decl * d1, Decl * d2) {
+                        // only care if they're equal
+                        DeclarationWithType * dwt1 = dynamic_cast<DeclarationWithType *>( d1 );
+                        DeclarationWithType * dwt2 = dynamic_cast<DeclarationWithType *>( d2 );
+                        if ( dwt1 && dwt2 ) {
+                                if ( dwt1->get_name() == dwt2->get_name() && ResolvExpr::typesCompatible( dwt1->get_type(), dwt2->get_type(), SymTab::Indexer() ) ) {
+                                        // std::cerr << "=========== equal:" << std::endl;
+                                        // std::cerr << "d1: " << d1 << std::endl;
+                                        // std::cerr << "d2: " << d2 << std::endl;
+                                        return false;
+                                }
+                        }
+                        return d1 < d2;
+                };
+                std::set<Decl *, decltype(pred)> unique_members( assertions.begin(), assertions.end(), pred );
+                // if ( unique_members.size() != assertions.size() ) {
+                //      std::cerr << "============different" << std::endl;
+                //      std::cerr << unique_members.size() << " " << assertions.size() << std::endl;
+                // }
+
+                std::list< Decl * > order;
+                order.splice( order.end(), assertions );
+                std::copy_if( order.begin(), order.end(), back_inserter( assertions ), [&]( Decl * decl ) {
+                        return unique_members.count( decl );
+                });
+        }
+
+        // expand assertions from trait instance, performing the appropriate type variable substitutions
+        template< typename Iterator >
+        void expandAssertions( TraitInstType * inst, Iterator out ) {
+                assertf( inst->baseTrait, "Trait instance not linked to base trait: %s", toString( inst ).c_str() );
+                std::list< DeclarationWithType * > asserts;
+                for ( Declaration * decl : inst->baseTrait->members ) {
+                        asserts.push_back( safe_dynamic_cast<DeclarationWithType *>( decl->clone() ) );
+                }
+                // substitute trait decl parameters for instance parameters
+                applySubstitution( inst->baseTrait->parameters.begin(), inst->baseTrait->parameters.end(), inst->parameters.begin(), asserts.begin(), asserts.end(), out );
+        }
+
+        void LinkReferenceToTypes::visit( TraitDecl * traitDecl ) {
+                Parent::visit( traitDecl );
+
+                if ( traitDecl->name == "sized" ) {
+                        // "sized" is a special trait - flick the sized status on for the type variable
+                        assertf( traitDecl->parameters.size() == 1, "Built-in trait 'sized' has incorrect number of parameters: %zd", traitDecl->parameters.size() );
+                        TypeDecl * td = traitDecl->parameters.front();
+                        td->set_sized( true );
+                }
+
+                // move assertions from type parameters into the body of the trait
+                for ( TypeDecl * td : traitDecl->parameters ) {
+                        for ( DeclarationWithType * assert : td->assertions ) {
+                                if ( TraitInstType * inst = dynamic_cast< TraitInstType * >( assert->get_type() ) ) {
+                                        expandAssertions( inst, back_inserter( traitDecl->members ) );
+                                } else {
+                                        traitDecl->members.push_back( assert->clone() );
+                                }
+                        }
+                        deleteAll( td->assertions );
+                        td->assertions.clear();
+                } // for
+        }
+
+        void LinkReferenceToTypes::visit( TraitInstType * traitInst ) {
                 Parent::visit( traitInst );
-                if ( traitInst->get_name() == "sized" ) {
-                        // "sized" is a special trait with no members - just flick the sized status on for the type variable
-                        if ( traitInst->get_parameters().size() != 1 ) {
-                                throw SemanticError( "incorrect number of trait parameters: ", traitInst );
-                        }
-                        TypeExpr * param = safe_dynamic_cast< TypeExpr * > ( traitInst->get_parameters().front() );
-                        TypeInstType * inst = safe_dynamic_cast< TypeInstType * > ( param->get_type() );
-                        TypeDecl * decl = inst->get_baseType();
-                        decl->set_sized( true );
-                        // since "sized" is special, the next few steps don't apply
-                        return;
-                }
-
                 // handle other traits
-                TraitDecl *traitDecl = indexer->lookupTrait( traitInst->get_name() );
+                TraitDecl *traitDecl = indexer->lookupTrait( traitInst->name );
                 if ( ! traitDecl ) {
-                        throw SemanticError( "use of undeclared trait " + traitInst->get_name() );
+                        throw SemanticError( "use of undeclared trait " + traitInst->name );
                 } // if
                 if ( traitDecl->get_parameters().size() != traitInst->get_parameters().size() ) {
                         throw SemanticError( "incorrect number of trait parameters: ", traitInst );
                 } // if
-
-                for ( TypeDecl * td : traitDecl->get_parameters() ) {
-                        for ( DeclarationWithType * assert : td->get_assertions() ) {
-                                traitInst->get_members().push_back( assert->clone() );
-                        } // for
-                } // for
-
-                // need to clone members of the trait for ownership purposes
-                std::list< Declaration * > members;
-                std::transform( traitDecl->get_members().begin(), traitDecl->get_members().end(), back_inserter( members ), [](Declaration * dwt) { return dwt->clone(); } );
-
-                applySubstitution( traitDecl->get_parameters().begin(), traitDecl->get_parameters().end(), traitInst->get_parameters().begin(), members.begin(), members.end(), back_inserter( traitInst->get_members() ) );
+                traitInst->baseTrait = traitDecl;
 
                 // need to carry over the 'sized' status of each decl in the instance
@@ -498 +544 @@
                         }
                 }
+                // normalizeAssertions( traitInst->members );
         }
 
@@ -561 +608 @@
         void forallFixer( Type * func ) {
                 for ( TypeDecl * type : func->get_forall() ) {
-                        std::list< DeclarationWithType * > toBeDone, nextRound;
-                        toBeDone.splice( toBeDone.end(), type->get_assertions() );
-                        while ( ! toBeDone.empty() ) {
-                                for ( DeclarationWithType * assertion : toBeDone ) {
-                                        if ( TraitInstType *traitInst = dynamic_cast< TraitInstType * >( assertion->get_type() ) ) {
-                                                // expand trait instance into all of its members
-                                                for ( Declaration * member : traitInst->get_members() ) {
-                                                        DeclarationWithType *dwt = safe_dynamic_cast< DeclarationWithType * >( member );
-                                                        nextRound.push_back( dwt->clone() );
-                                                }
-                                                delete traitInst;
-                                        } else {
-                                                // pass assertion through
-                                                FixFunction fixer;
-                                                assertion = assertion->acceptMutator( fixer );
-                                                if ( fixer.get_isVoid() ) {
-                                                        throw SemanticError( "invalid type void in assertion of function ", func );
-                                                }
-                                                type->get_assertions().push_back( assertion );
-                                        } // if
-                                } // for
-                                toBeDone.clear();
-                                toBeDone.splice( toBeDone.end(), nextRound );
-                        } // while
+                        std::list< DeclarationWithType * > asserts;
+                        asserts.splice( asserts.end(), type->assertions );
+                        // expand trait instances into their members
+                        for ( DeclarationWithType * assertion : asserts ) {
+                                if ( TraitInstType *traitInst = dynamic_cast< TraitInstType * >( assertion->get_type() ) ) {
+                                        // expand trait instance into all of its members
+                                        expandAssertions( traitInst, back_inserter( type->assertions ) );
+                                        delete traitInst;
+                                } else {
+                                        // pass other assertions through
+                                        type->assertions.push_back( assertion );
+                                } // if
+                        } // for
+                        // apply FixFunction to every assertion to check for invalid void type
+                        for ( DeclarationWithType *& assertion : type->assertions ) {
+                                FixFunction fixer;
+                                assertion = assertion->acceptMutator( fixer );
+                                if ( fixer.get_isVoid() ) {
+                                        throw SemanticError( "invalid type void in assertion of function ", func );
+                                } // if
+                        } // for
+                        // normalizeAssertions( type->assertions );
                 } // for
         }

src/SynTree/Mutator.cc

@@ -538 +538 @@
 Type * Mutator::mutate( TraitInstType *aggregateUseType ) {
         handleReferenceToType( aggregateUseType );
-        mutateAll( aggregateUseType->get_members(), *this );
         return aggregateUseType;
 }

src/SynTree/ReferenceToType.cc

@@ -132 +132 @@
 std::string TraitInstType::typeString() const { return "trait"; }
 
-TraitInstType::TraitInstType( const TraitInstType &other ) : Parent( other ) {
-        cloneAll( other.members, members );
+TraitInstType::TraitInstType( const Type::Qualifiers & tq, TraitDecl * baseTrait, const std::list< Attribute * > & attributes ) : Parent( tq, baseTrait->name, attributes ), baseTrait( baseTrait ) {}
+
+TraitInstType::TraitInstType( const TraitInstType &other ) : Parent( other ), baseTrait( other.baseTrait ) {
 }
 
 TraitInstType::~TraitInstType() {
-        deleteAll( members );
 }
 

src/SynTree/Type.h

@@ -471 +471 @@
         typedef ReferenceToType Parent;
   public:
-        // this member is filled in by the validate pass, which instantiates the members of the correponding
-        // aggregate with the actual type parameters specified for this use of the context
-        std::list< Declaration* > members;
-
-        TraitInstType( const Type::Qualifiers & tq, const std::string & name, const std::list< Attribute * > & attributes = std::list< Attribute * >()  ) : Parent( tq, name, attributes ) {}
+        // this decl is not "owned" by the trait inst; it is merely a pointer to elsewhere in the tree,
+        // where the trait used in this type is actually defined
+        TraitDecl * baseTrait = nullptr;
+
+        TraitInstType( const Type::Qualifiers & tq, const std::string & name, const std::list< Attribute * > & attributes = std::list< Attribute * >() ) : Parent( tq, name, attributes ) {}
+        TraitInstType( const Type::Qualifiers & tq, TraitDecl * baseTrait, const std::list< Attribute * > & attributes = std::list< Attribute * >() );
         TraitInstType( const TraitInstType & other );
         ~TraitInstType();
-
-        std::list< Declaration* >& get_members() { return members; }
 
         virtual bool isComplete() const;

src/SynTree/TypeSubstitution.h

@@ -177 +177 @@
 void applySubstitution( FormalIterator formalBegin, FormalIterator formalEnd, ActualIterator actual, MemberIterator memberBegin, MemberIterator memberEnd, OutputIterator out ) {
         TypeSubstitution sub = TypeSubstitution( formalBegin, formalEnd, actual );
-        for ( std::list< Declaration* >::iterator i = memberBegin; i != memberEnd; ++i ) {
+        for ( auto i = memberBegin; i != memberEnd; ++i ) {
                 sub.apply( *i );
                 *out++ = *i;

src/SynTree/Visitor.cc

@@ -429 +429 @@
 void Visitor::visit( TraitInstType *aggregateUseType ) {
         handleReferenceToType( static_cast< ReferenceToType * >( aggregateUseType ) );
-        acceptAll( aggregateUseType->get_members(), *this );
 }
 

src/prelude/prelude.cf

@@ -15 +15 @@
 
 // Section numbers from: http://plg.uwaterloo.ca/~cforall/refrat.pdf
+
+// ------------------------------------------------------------
+//
+// Section 6.7.11 Trait Declarations
+// Note: the sized trait is used in declarations later in this
+// file, so it must be out of order.
+//
+// ------------------------------------------------------------
+
+trait sized(dtype T) {};
 
 // ------------------------------------------------------------